Ina's parents were marine biologists who found some remnants of Atlantis and brought a book back up. Not realizing it was the cause, Ina brought it up to her room and read from it. The ritual fused her with her plushie octopuses. This is why her tentacles don't have 3D suckers; they're just fabric patterns on fabric. Takodachi/tentacultists are just her other plushies brought to life Thousand Acre Woods style. AO-chan is her parents fused together into one wise being. Her streams use the power of the tentacult to slow the awakening of the Slumbering Shadow from Beyond the Stars that will end the world.
Ame comes from a future where they failed; she was created from the strongest, bravest, and brightest of our kind and given our strongest weapons. The last of humanity flung their brightest light into the past to stop the unthinkable. Her arrival awoke Gura, the sole surviving Atlantean, from her 9000 year hibernation after a mysterious artifact destroyed the ancient civilization. Now they have to investigate together with Ina to either put the Slumbering Evil 6 feet under before it regains consciousness or use the power of friendship to change it's mind.
Mori's boss detected an anomaly at the end of the world where billions of people not scheduled to die were silenced and another anomaly that hopped realities. All the other reapers were too busy handling the paperwork for the immigration influx of 13 billion new souls and Mori was already on Earth to check on Kiara after her last reincarnation so they sent the deputy junior reaper to check things out. She encountered the other 3 first when she followed Ame's (?strangely familiar?) displaced soul and found the Ina's MC Escher house with takos tending the garden.
Kiara is phoenix that got bored of living infinite lifetimes so she tried starting her own billion dollar fast food chain. Her key to success is using her star power and bird language to convince the food(chickens) to also work as staff for no pay; this pushed her profit margins through the roof and killed off her competitors:Captain Saunders and WacDonalds. She meets up with the group when she hits up the local pub for a drink. Overhearing their discussion in passing, she immediately sat down in the booth next to the extremely stacked pink haired girl with the cleavage window and legs for days (she doesn't recognize Mori from her past lives). Under the guise of protecting her customers (1 billion buckets sold) she uses her company's manpower and funds to aid the investigation, often splitting off with Mori or eyeballing any boing boing broads they come across.
The sun sets on the unwitting humankind and only an unlikely quintet alliance can prevent the eternal screaming nightfall. HOLOMYTH
Give me more of your chuuniest HoloMyth/Council thoughts please